PBS Eons | The Huge Extinctions We Are Just Now Discovering
What graptolites tell us is a story of incredible changes in the ocean, of periods where the oceans became poisonous and suffocating before eventually clearing up again.
2023-11-21 22:00:00 - PBS Eons
They unlock extinctions and recoveries that scientists didn't see. And, most of all, they show us how unpredictable the Silurian period really could be.